Abstract
We have deduced the coherent scattering amplitude of as 3.55±0.21 fm by measuring the neutron-diffraction patterns of calcite enriched to 32% in . We have employed this value in calculating the direct-capture cross sections of the primary electric-dipole γ transitions in using optical-model potentials with physically realistic parameters. The calculated cross sections agree reasonably well with measurements showing that thermal-neutron capture by is controlled largely by a simple direct mechanism.
- Received 8 April 1991
DOI:https://doi.org/10.1103/PhysRevC.44.518
©1991 American Physical Society